<%
Option Explicit
Session.CodePage = 65001
Response.Charset = "UTF-8"
Response.Expires = -1
Response.AddHeader "Pragma", "no-cache"
Response.AddHeader "cache-ctrol", "no-cache"
Dim VC, Code
Randomize
Set VC = New NetRube_VerifyCode
With VC
  Code = Int(Rnd * 9000 + 1000)
  Session("firstecode") = ""&Code
  .BGroundColor = "#FFFFFF" ' 图片背景颜色
  .FGroundColor = "#000000" ' 前景（文本）颜色
  .VerifyCode Code, false'False  ' 处理验证码，第二个参数为是否显示彩色文本
  .Noises 50, true   ' 添加杂点，第一个参数为杂点数量，第二个参数为是否显示彩色杂点
  .Write      ' 输出图片
End With
Set VC = Nothing
Class NetRube_VerifyCode
 Public GlobalColorTable(), LocalColorTable()
 Public TransparentColorIndex, UseTransparency
 Public GIF89a
 Public Comment
 
 Private FGroundColorIndex, BGroundColorIndex
 Private Image
 Private GlobalColorTableSize, GlobalColorTableFlag, LocalColorTableSize, LocalColorTableFlag
 Private Width_, Height_
 Private LeftPosition, TopPosition
 Private Bits, ColorResolution, CodeSize
 Private PixelAspectRatio
 Private SortFlag, InterlaceFlag
 Private Seperator, GraphicControl, EndOfImage
 Private Reserved
 
 Private Font
 Private Letter(19)
 
 Private Sub Class_Initialize()
  Image = ""
    
  GIF89a = False
  
  ReDim GlobalColorTable(256)
  GlobalColorTableSize = 7
  GlobalColorTableFlag = True
  
  GlobalColorTable(2) = RGB(255, 0, 0)
  GlobalColorTable(3) = RGB(0, 255, 0)
  GlobalColorTable(4) = RGB(0, 0, 255)
  GlobalColorTable(5) = RGB(255, 255, 0)
  GlobalColorTable(6) = RGB(0, 255, 255)
  GlobalColorTable(7) = RGB(255, 0, 255)
  
  ReDim LocalColorTable(0)
  LocalColorTableSize = 0
  LocalColorTableFlag = False
  
  ColorResolution = 7
  Bits   = 7
  CodeSize  = 7
  
  BGroundColorIndex = 0
  FGroundColorIndex = 1
  TransparentColorIndex = 0
  UseTransparency  = False
  
  LeftPosition = 0
  TopPosition  = 0
  Width_   = 20
  Height_   = 20
  
  Clear
  
  PixelAspectRatio = 0
  SortFlag   = False
  InterlaceFlag  = False
  Seperator   = Asc(",")
  GraphicControl  = Asc("!")
  EndOfImage   = Asc(";")
  
  Comment = ""
  
  Reserved = 0
  
  Set Font = Server.CreateObject("Scripting.Dictionary")

  Letter(0) = "00000000000000"
  Letter(1) = "00001111100000"
  Letter(2) = "00011111110000"
  Letter(3) = "00111000111000"
  Letter(4) = "00110000011100"
  Letter(5) = "01110000001100"
  Letter(6) = "01100000001110"
  Letter(7) = "01100000001110"
  Letter(8) = "11100000001110"
  Letter(9) = "11000000001110"
  Letter(10) = "11000000001110"
  Letter(11) = "11100000001110"
  Letter(12) = "11100000001100"
  Letter(13) = "11100000001100"
  Letter(14) = "01100000001100"
  Letter(15) = "01110000011100"
  Letter(15) = "00111000011000"
  Letter(16) = "00011111110000"
  Letter(17) = "00001111100000"
  Letter(18) = "00000000000000"
  Font.Add "0", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00000001110000"
  Letter(2) = "00000001110000"
  Letter(3) = "00000011100000"
  Letter(4) = "00000011000000"
  Letter(5) = "00000011000000"
  Letter(6) = "00000011000000"
  Letter(7) = "00000111000000"
  Letter(8) = "00000111000000"
  Letter(9) = "00000111000000"
  Letter(10) = "00000110000000"
  Letter(11) = "00000110000000"
  Letter(12) = "00000110000000"
  Letter(13) = "00000110000000"
  Letter(14) = "00000110000000"
  Letter(15) = "00000110000000"
  Letter(15) = "00000110000000"
  Letter(16) = "00000110000000"
  Letter(17) = "00000010000000"
  Letter(18) = "00000000000000"
  Font.Add "1", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00001111110000"
  Letter(2) = "00011111111000"
  Letter(3) = "00111000011100"
  Letter(4) = "01110000011100"
  Letter(5) = "01110000011000"
  Letter(6) = "01100000011000"
  Letter(7) = "00000000111000"
  Letter(8) = "00000001110000"
  Letter(9) = "00000001110000"
  Letter(10) = "00000011000000"
  Letter(11) = "00000111000000"
  Letter(12) = "00001110000000"
  Letter(13) = "00011000000000"
  Letter(14) = "00011000000000"
  Letter(15) = "00110000011100"
  Letter(16) = "01101111111100"
  Letter(17) = "01111111111110"
  Letter(18) = "01111100000000"
  Letter(19) = "00000000000000"
  Font.Add "2", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00001111111000"
  Letter(2) = "00111111111000"
  Letter(3) = "01110000111100"
  Letter(4) = "01100000011000"
  Letter(5) = "01000000111000"
  Letter(6) = "00000000111000"
  Letter(7) = "00000001110000"
  Letter(8) = "00000011000000"
  Letter(9) = "00000111110000"
  Letter(10) = "00000100111000"
  Letter(11) = "00000000011100"
  Letter(12) = "00000000011100"
  Letter(13) = "00000000011100"
  Letter(14) = "00000000011100"
  Letter(15) = "00000000011000"
  Letter(16) = "11100000111000"
  Letter(17) = "11111111110000"
  Letter(18) = "01111111100000"
  Letter(19) = "00000000000000"
  Font.Add "3", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00000000111000"
  Letter(2) = "00000001111000"
  Letter(3) = "00000011100000"
  Letter(4) = "00000111011100"
  Letter(5) = "00001110011100"
  Letter(6) = "00001100011000"
  Letter(7) = "00011000111000"
  Letter(8) = "00111000110000"
  Letter(9) = "01110000110000"
  Letter(10) = "01100000110000"
  Letter(11) = "01100000110000"
  Letter(12) = "11000111111110"
  Letter(13) = "11111111111100"
  Letter(14) = "11111111100000"
  Letter(15) = "11100001100000"
  Letter(16) = "00000001110000"
  Letter(17) = "00000000110000"
  Letter(18) = "00000000110000"
  Letter(19) = "00000000100000"
  Font.Add "4", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00001100000100"
  Letter(2) = "00011111111110"
  Letter(3) = "00011111111100"
  Letter(4) = "00011110000000"
  Letter(5) = "00011000000000"
  Letter(6) = "00111000000000"
  Letter(7) = "00111000000000"
  Letter(8) = "00111111110000"
  Letter(9) = "00111111111000"
  Letter(10) = "00000000011000"
  Letter(11) = "00000000011000"
  Letter(12) = "00000000011000"
  Letter(13) = "00000000011000"
  Letter(14) = "00000000011000"
  Letter(15) = "00000000011000"
  Letter(16) = "00000001111000"
  Letter(17) = "01111111110000"
  Letter(18) = "00111111000000"
  Letter(19) = "00000000100000"
  Font.Add "5", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00000011110000"
  Letter(2) = "00000111100000"
  Letter(3) = "00001110000000"
  Letter(4) = "00011100000000"
  Letter(5) = "00111000000000"
  Letter(6) = "00110000000000"
  Letter(7) = "00110000000000"
  Letter(8) = "01111111110000"
  Letter(9) = "01111111111000"
  Letter(10) = "01110000011100"
  Letter(11) = "01100000001100"
  Letter(12) = "01100000001100"
  Letter(13) = "01100000001100"
  Letter(14) = "01100000001100"
  Letter(15) = "01110000011100"
  Letter(16) = "00110000011100"
  Letter(17) = "00111111111000"
  Letter(18) = "00011111110000"
  Letter(19) = "00000000000000"
  Font.Add "6", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00100111111110"
  Letter(2) = "01111111111100"
  Letter(3) = "01111110011100"
  Letter(4) = "00000000011000"
  Letter(5) = "00000000111000"
  Letter(6) = "00000000110000"
  Letter(7) = "00000000110000"
  Letter(8) = "00000000110000"
  Letter(9) = "00000001110000"
  Letter(10) = "00000001100000"
  Letter(11) = "00000001100000"
  Letter(12) = "00000001100000"
  Letter(13) = "00000001100000"
  Letter(14) = "00000011100000"
  Letter(15) = "00000011100000"
  Letter(16) = "00000011100000"
  Letter(17) = "00000001000000"
  Letter(18) = "00000001000000"
  Letter(19) = "00000000000000"
  Font.Add "7", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00001111110000"
  Letter(2) = "00011111111000"
  Letter(3) = "00111000011000"
  Letter(4) = "00110000011000"
  Letter(5) = "01110000011100"
  Letter(6) = "01110000011000"
  Letter(7) = "00110000011000"
  Letter(8) = "00111101111000"
  Letter(9) = "00011111111000"
  Letter(10) = "00111000111100"
  Letter(11) = "01110000001100"
  Letter(12) = "01110000001100"
  Letter(13) = "01100000001110"
  Letter(14) = "01100000001100"
  Letter(15) = "01100000001100"
  Letter(16) = "01110000011100"
  Letter(17) = "00111111111100"
  Letter(18) = "00011111110000"
  Letter(19) = "00000000000000"
  Font.Add "8", Letter
  
  Letter(0) = "00000000000000"
  Letter(1) = "00011111110000"
  Letter(2) = "00111111111000"
  Letter(3) = "01110000111000"
  Letter(4) = "01110000011100"
  Letter(5) = "01100000001100"
  Letter(6) = "01100000001100"
  Letter(7) = "01100000001100"
  Letter(8) = "01100000001100"
  Letter(9) = "01110000011100"
  Letter(10) = "00111111111100"
  Letter(11) = "00011111111100"
  Letter(12) = "00000000011000"
  Letter(13) = "00000000011000"
  Letter(14) = "00000000111000"
  Letter(15) = "00000001110000"
  Letter(16) = "00000011100000"
  Letter(17) = "00000111000000"
  Letter(18) = "00011110000000"
  Letter(19) = "00000000000000"
  Font.Add "9", Letter
 End Sub
 
 Private Sub Class_Terminate()
  Font.RemoveAll
  Set Font = Nothing
 End Sub
 
 Public Property Get Width()
  Width = Width_
 End Property
 
 Public Property Get Height()
  Height = Height_
 End Property
 
 Public Property Get Version()
  Version = "NetRube VerifyCode Class 1.0 Build 20041225"
 End Property
 
 Public Property Let BGroundColor(ByVal Color)
  GlobalColorTable(0) = MakeColor(Color)
  BGroundColorIndex = 0
 End Property
 
 Public Property Let FGroundColor(ByVal Color)
  GlobalColorTable(1) = MakeColor(Color)
  FGroundColorIndex = 1
 End Property
 
 Public Property Get Pixel(ByVal PX, ByVal PY)
  If (PX > 0 And PX <= Width_) And (PY > 0 And PY <= Height_) Then
   Pixel = AscB(MidB(Image, (Width_ * (PY - 1)) + PX, 1))
  Else
   Pixel = 0
  End If
 End Property
 
 Public Property Let Pixel(ByVal PX, ByVal PY, PValue)
  Dim Offset
  
  PX  = Int(PX)
  PY  = Int(PY)
  PValue = Int(PValue)
  
  Offset = Width_ * (PY - 1)
  
  If (PX > 0 And PX <= Width_) And (PY > 0 And PY <= Height_) Then
   Image = LeftB(Image, Offset + (PX - 1)) & ChrB(PValue) & RightB(Image, LenB(Image) - (Offset + PX))
  End If
 End Property
 
 Public Sub Clear()
  Image = String(Width_ * (Height_ + 1) / 2, ChrB(BGroundColorIndex) & ChrB(BGroundColorIndex))
 End Sub
 
 Public Sub Resize(ByVal NewWidth, ByVal NewHeight, RPreserve)
  Dim OldImage, OldWidth, OldHeight
  Dim CopyWidth, CopyHeight
  Dim X, Y
  
  If RPreserve Then
   OldImage = Image
   OldWidth = Width_
   OldHeight = Height_
  End If
  
  Width_ = NewWidth
  Height_ = NewHeight
  
  Clear
  
  If RPreserve Then
   If NewWidth > OldWidth Then CopyWidth = OldWidth Else CopyWidth = NewWidth
   If NewHeight > OldHeight Then CopyHeight = OldHeight Else CopyHeight = NewHeight
   
   Width_ = NewWidth
   Height_ = NewHeight
   
   For Y = 1 To CopyHeight
    For X = 1 To CopyWidth
     Pixel(X, Y) = AscB(MidB(OldImage, (OldWidth * (Y - 1)) + X, 1))
    Next
   Next
  End If
 End Sub
 
 Private Function ShiftLeft(SLValue, SLBits)
  ShiftLeft = SLValue * (2 ^ SLBits)
 End Function
 
 Private Function ShiftRight(SRValue, SRBits)
  ShiftRight = Int(SRValue / (2 ^ SRBits))
 End Function
 
 Private Function Low(LValue)
  Low = LValue And &HFF
 End Function
 
 Private Function High(HValue)
  High = ShiftRight(HValue, 8)
 End Function
 
 Private Function Blue(BValue)
  Blue = Low(ShiftRight(BValue, 16))
 End Function
 
 Private Function Green(GValue)
  Green = Low(ShiftRight(GValue, 8))
 End Function
 
 Private Function Red(RValue)
  Red = Low(RValue)
 End Function
 
 Private Function MakeColor(MCValue)
  MakeColor = CLng("&H" & Right(MCValue, 2) & Mid(MCValue, 4, 2) & Mid(MCValue, 2, 2))
 End Function
 
 Private Function GetWord(GWValue)
  GetWord = ShiftLeft(AscB(RightB(GWValue, 1)), 8) Or AscB(LeftB(GWValue, 1))
 End Function
 
 Private Function MakeWord(MWValue)
  MakeWord = ChrB(Low(MWValue)) & ChrB(High(MWValue))
 End Function
 
 Private Function MakeByte(MBValue)
  MakeByte = ChrB(Low(MBValue))
 End Function
 
 Private Function UncompressedData()
  Dim ClearCode, ChunkMax, EndOfStream
  Dim UDData, UD, U
  
  UncompressedData = ""
  
  ClearCode   = 2 ^ Bits
  ChunkMax   = 2 ^ Bits - 2
  EndOfStream   = ClearCode + 1
  
  UDData    = ""
  
  For U = 1 To LenB(Image) Step ChunkMax
   UDData = UDData & MidB(Image, U, ChunkMax) & ChrB(ClearCode)
  Next
  
  For U = 1 To LenB(UDData) Step &HFF
   UD     = MidB(UDData, U, &HFF)
   UncompressedData = UncompressedData & MakeByte(LenB(UD)) & UD
  Next
  
  UncompressedData = UncompressedData & MakeByte(&H00)
  UncompressedData = UncompressedData & MakeByte(EndOfStream)
 End Function
 
 Private Function GetGColorTable()
  Dim GGCT
  
  GetGColorTable = ""
  
  For GGCT = 0 To UBound(GlobalColorTable) - 1
   GetGColorTable = GetGColorTable & MakeByte(Red(GlobalColorTable(GGCT)))
   GetGColorTable = GetGColorTable & MakeByte(Green(GlobalColorTable(GGCT)))
   GetGColorTable = GetGColorTable & MakeByte(Blue(GlobalColorTable(GGCT)))
  Next
 End Function
 
 Private Function GetLColorTable()
  Dim GLCT
  
  GetLColorTable = ""
  
  For GLCT = 0 To UBound(LocalColorTable) - 1
   GetLColorTable = GetLColorTable & MakeByte(Red(LocalColorTable(GLCT)))
   GetLColorTable = GetLColorTable & MakeByte(Green(LocalColorTable(GLCT)))
   GetLColorTable = GetLColorTable & MakeByte(Blue(LocalColorTable(GLCT)))
  Next
 End Function
 
 Private Function GlobalDescriptor()
  GlobalDescriptor = 0
  
  If GlobalColorTableFlag Then GlobalDescriptor = GlobalDescriptor Or ShiftLeft(1, 7)
  GlobalDescriptor = GlobalDescriptor Or ShiftLeft(ColorResolution, 7)
  If SortFlag Then GlobalDescriptor = GlobalDescriptor Or ShiftLeft(1, 3)
  GlobalDescriptor = GlobalDescriptor Or GlobalColorTableSize
 End Function
 
 Private Function LocalDescriptor()
  LocalDescriptor = 0
  
  If LocalColorTableFlag Then LocalDescriptor = LocalDescriptor Or ShiftLeft(1, 7)
  If InterlaceFlag Then LocalDescriptor = LocalDescriptor Or ShiftLeft(1, 6)
  If SortFlag Then LocalDescriptor = LocallDescriptor Or ShiftLeft(1, 5)
  LocalDescriptor = LocalDescriptor Or ShiftLeft(Reserved, 3)
  LocalDescriptor = LocalDescriptor Or LocalColorTableSize
 End Function
 
 Private Property Get ImageData()
  Dim Text, I
  
  ImageData = GIFHeader
  ImageData = ImageData & MakeWord(Width_)
  ImageData = ImageData & MakeWord(Height_)
  ImageData = ImageData & MakeByte(GlobalDescriptor)
  ImageData = ImageData & MakeByte(BGroundColorIndex)
  ImageData = ImageData & MakeByte(PixelAspectRatio)
  ImageData = ImageData & GetGColorTable
  
  If GIF89a Then
   If UseTransparency Then
    ImageData = ImageData & MakeByte(GraphicControl)
    ImageData = ImageData & MakeByte(&HF9)
    ImageData = ImageData & MakeByte(&H04)
    ImageData = ImageData & MakeByte(&H01)
    ImageData = ImageData & MakeByte(&H00)
    ImageData = ImageData & MakeByte(TransparentColorIndex)
    ImageData = ImageData & MakeByte(&H00)
   End If
   
   If Comment <> "" Then
    ImageData = ImageData & MakeByte(GraphicControl)
    ImageData = ImageData & MakeByte(&HFE)
    Text = Left(Comment, &HFF)
    ImageData = ImageData & MakeByte(Len(Text))
    For I = 1 To Len(Text)
     ImageData = ImageData & MakeByte(Asc(Mid(Text, I, 1)))
    Next
    ImageData = ImageData & MakeByte(&H00)
   End If
  End If
  
  ImageData = ImageData & MakeByte(Seperator)
  ImageData = ImageData & MakeWord(LeftPosition)
  ImageData = ImageData & MakeWord(TopPosition)
  ImageData = ImageData & MakeWord(Width_)
  ImageData = ImageData & MakeWord(Height_)
  ImageData = ImageData & MakeByte(LocalDescriptor)
  ImageData = ImageData & MakeByte(CodeSize)
  ImageData = ImageData & UncompressedData
  ImageData = ImageData & MakeByte(&H00)
  ImageData = ImageData & MakeByte(EndOfImage)
 End Property
 
 Public Sub Write()
  Response.ContentType = "image/gif"
  Response.BinaryWrite ImageData
 End Sub
 
 Private Function GIFHeader()
  GIFHeader = ""
  GIFHeader = GIFHeader & ChrB(Asc("G"))
  GIFHeader = GIFHeader & ChrB(Asc("I"))
  GIFHeader = GIFHeader & ChrB(Asc("F"))
  GIFHeader = GIFHeader & ChrB(Asc("8"))
  If GIF89a Then GIFHeader = GIFHeader & ChrB(Asc("9")) Else GIFHeader = GIFHeader & ChrB(Asc("7")) End If
  GIFHeader = GIFHeader & ChrB(Asc("a"))
 End Function
 
 Public Sub VerifyCode(Text, VCColor)
  Dim I1, I2, I3
  Dim VCX, VCY, VCIndex
  
  Resize 14 * Len(Text) + 10, UBound(Letter) + 10, False
  
  Randomize
  VCX = Int(Rnd * 10)
  VCY = Int(Rnd * (Height_ - UBound(Letter)))
  
  For I1 = 0 To UBound(Letter) - 1
   For I2 = 1 To Len(Text)
    For I3 = 1 To Len(Font(Mid(Text, I2, 1))(I1))
     VCIndex = CLng(Mid(Font(Mid(Text, I2, 1))(I1), I3, 1))
     
     If VCIndex <> 0 Then
      If VCColor Then
       Randomize
       VCIndex = Int(Rnd * 7)
      End If
      
      Pixel(VCX + ((I2 - 1) * Len(Letter(0))) + I3, VCY + I1) = VCIndex
     End If
    Next
   Next
  Next
 End Sub
 
 Public Sub Noises(Amount, NColor)
  Dim NI, NIndex
    
  For NI = 1 To Amount
   NIndex = 1
   
   If NColor Then
    Randomize
    NIndex = Int(Rnd * 7)
   End If
   
   Pixel(Int(Rnd * Width_), Int(Rnd * Height_)) = NIndex
  Next
 End Sub
End Class
%>
